Stoker mechanism



Aug. 11, 1936. HUNT v 2,Q50,842

STOKER MECHANISM Original Filed April 25, 1929 [NI/ENTOE By Andrewlfi H [1111 ATTORNEY Patented Aug. 11, 1936 2,050,842 .STOKER MECHANISM Andrew M. Hunt, San Francisco, Calif., assignor to The Standard Stoker Company, Incorpo rated, a corporation of Delaware Application April 25, 1929, Serial No. 357,895 Renewed February 2!), 1 935 2 Claims. (Cl. 110101) The invention relates to stokers for locomotives or other steam boilers and it has for one of its objects the provision of an improved mechanism having means for conveying the fuel in a single stream from a source of supply to' distributing the to be sp t nto a plurality o in e esi ni. treams an oje t n a a paths,

Another and more specific object of the invention is the provision of stoker mechanism in which the fuel at the point of emission from the-con veyor is split and divided laterally intothe zone of action of independent distributing. jets which act upon and spread the fuel over the fire.

A further object of the invention is to provide a new and improved stoker having a novel arrangement of means for receiving and distributing the fuel over the firebed.

This invention materially simplifies and distinctly improves stokers of the character in which the fuel is split or divided intoa plurality of streams before it is delivered to the fire. Its further objects and advantages will appear from the following specification when read in connection with the accompanying drawing, in which Fig. 1 is a horizontal plan section on line l -l of Fig. 2;

Fig. 2 is a fragmentary vertical section through a portion of a boiler with the invention being shown in vertical section on line 22 of Fig. 1; and

Fig. 3 is a section on line 33 of Fig. 2 illustrating the splitter.

On the drawing the invention is shown as being applied to a locomotive but it is apparent that it is applicable to other steam boilers. In the drawing, the numeral l0 designates a locomotive having a firebox ll provided with a backwall l2 having a firing opening l3 therein, which opening may, if preferred, be the usual hand firing opening through which the fuel is delivered into the firebox on to the grates l 4 thereof, which may be of any well known construction.

The stoker comprises a feeding or conveying conduit l5 for bringing the fuel from a source of supply to the locomotive. In the form of construction as shown by these figures, the conduit l5 comprises the transfer conduit l6 having the helical screw 20 revolvably mounted therein for conveying fuel from the tender to the locomotive, and a fuel nozzle ll connected to the forward end of said transfer conduit by a universal joint I8 and extending upwardly and forwardly therefrom to the firing opening, and in the particular application shown on the drawing, the nozzle extends through the deck 30. The nozzle ll comprises the curved elbow or riser portion 50 and a forwardly extending casing 5| surmounting the curved elbow and into which casing fuel is fed through an emission opening 52 at the upper 5 end of the curved elbow 58.

Preferably, the riser portion of the nozzle curves upwardly from said transfer conduit and has its upper portion opening forwardly for delivering fuel directly onto a distributing plate l9 1.; which extends forwardly therefrom within the firing opening l3. The nozzle is carried by the locomotive in any suitable manner as by means of a bracket t8 secured to the backhead l2 and by the laterally extending flanges lll'a and 40b of the nozzle and which are adapted to receive bolts or studs for fastening the nozzle to the backhead. v w

- The distributor plate i9 is provided with a pair of grooves 25, 22 having their front walls curved forwardly and laterally for directing a certain amount of the fuel laterally into the back corners of the firebox, these curved walls being raised slightly above the plane of the plate to constitute the abutment members 23 and 26 which act to intercept a portion of the fuel being delivered into the firebox, and to direct the portion intercepted to the rear of the firebox.

The fuel is projected into the firebox by suitable distributing means, there being shown for 30 this purpose a pair of fluid pressure nozzles, such as the steam nozzles 26 and N which are attached to the backwall 25 of the nozzle portion of the conduit. The conduit backwall may, if desired, be vertical at this point. These nozzles are spaced apart laterally so that the fuel will be directed forwardly toward the abutment members 23 and 24, respectively.

Suitable means are provided for directing the fuel advancing through the riser portion of the nozzle laterally in front of, and into the zone of action of, the nozzles 26 and 27, respectively. In the form of the construction illustrated a splitter or divider member 28 is employed for this purpose. This splitter member extends longitudinally of the locomotive and is triangular in cross section, with its apex 29 directed downwardly toward the fuel emission opening 52 of the elbow 50. The splitter member has its base secured to the top wall of the casing 5 l, in any suitable manner as by the bolts 36, 36a. If desired, it may be detachably connected to a door 3| hinged as at 32, the door 3| when open affords access to the interior of the upper portion of the nozzle or conduit for inspection, or for the purpose of hand 55 firing of the fuel to the distributing means. The door may be held normally closed in any suitable manner.

The splitter or divider member 28 extends forwardly a sufficient distance to direct the fuel laterally to each side thereof in front of the steam blasts issuing from the nozzles 26 and 21 which independently serve-to distribute their respective streams of fuel forward over the distributor plate l9, This splitter or divider member is so formed that it will not obstruct the delivery of fuel and its forward end is rounded so that it will not interfere with the distributingmeans in scattering the fuel uniformly over the fire.

If it is found desirable to vary the relative volume of the divided streams of fuel, this can be done by manual adjustment of the splitter 28, the splitter moving about the axis of the stud 36a and being held in any desired position by tightening of the wing nut which is in threaded engagement' -with the stud 36, which stud moves in an arcuate slot 31 in the door 3|.

In the operation of this device, the fuel will be transferred from the source of supply such as the tender of the locomotive and delivered forwardly through a single feeding conduit to the distributing means, there the stream of fuel being split and divided into a plurality of streams by the splitter or divider member 28 which is so arranged as to direct the divided streams of fuel laterally in both directions into the zone of action of the distributing means. A fiuid pressure, such as steam, conducted to the nozzles by suitable pipes 35, 35a, will be discharged against the divided streams of fuel for distributing the same over the grates l4.

While the drawing shows a pressure fluid means for projecting the fuel into the firebox it is within the broader aspects of the invention to employ other means such as mechanical distributing members for effecting the projecting of the plurality of streams into the firebox.

To those familiar with feeding of fuel mechanically to locomotives or other steam boilers it will be apparent that this invention provides a stoker mechanismin which the fuel feed is divided laterally into a plurality of streams before distribution, each stream being projected into the firebox whereby the effective distribution of the fuel over each side of the firebox is capable of control independently to its different portions. 5

I claim:

1. In combination, a boiler firebox provided with a backhead having a firing opening in the rear wall thereof, a fuel conduit having a discharge outlet to said opening extending forwardly 0 and upwardly thereto, an opening in the top of the upper part of said conduit provided with a hinged cover section, and a longitudinally extending rib member attached to said hinged section and facing downwardly therefrom arranged to 15 direct fuel laterally to each side of said rib.

, 2. In-c'ombination with a firebox having a wall with a firing opening therethrough, a stoker including a fuel casing having its mouth communicating with said opening, a feed conduit having 20 a discharge outlet opening upwardly'into and substantially centrally of said casing and arranged todeliver a single stream of fuel tosaid casing,

a distributor plate extending forwardly from said easing into the firebox, said plate being disposed 25 forward of the discharge outlet of said conduit, a divider member disposed longitudinally in said casing rearward of said plate and positioned over and above the discharge outlet of saidconduit,

, said divider member being substantially V-shaped 3 l in transverse cross section and arranged with the i apex ithereof directed toward the said *discharge outlet to split the single fuelstream into-two streams, and fuel projecting means comprising a pair of laterally spaced pressure fiuid nozzles disposed at the rear of the discharge outlet of the feed conduit, one at each side of said divider member, arranged to act against the fuel emerging from the conduit, said divider member being constructed and arranged to act on the fuel stream prior to the action of the fuel projecting means and to guide the divided streams of fuel laterally as they rise upwardly into the zone of action of the pressure fluid nozzles.

' ANDREW M. HUNT. 

